fix(@angular/cli): batch Prettier invocations during migration format… #3947

Job	Run time
list	27s
workflow (devkit-core-tests-rerun)	1m 36s
workflow (build-unit-tests)	2m 41s
workflow (modules-builder-tests)	2m 26s
workflow (build-cli)	2m 0s
workflow (devkit-core-tests)	1m 45s
	10m 55s

Provide feedback